(1S,2R)-2-[(2-methylpropan-2-yl)oxycarbonylamino]cyclohexane-1-carboxylic acid

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: TFA (1 ml) was added to tert-butyl (4aR*,5R*,10bR*)-5-phenyl-3,4,4a,5,6,10b-hexahydrobenzo[h]-1,6-naphthyridine-1(2H)-carboxylate (195 mg, 0.54 mmol), and the mixture was stirred at room temperature for 3 min. Ice water was added to the reaction mixture, basified with 8N aqueous sodium hydroxide solution, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The residue was dissolved in tetrahydrofuran (3 ml), (1S,2R)-2-[(tert-butoxycarbonyl)amino]cyclohexanecarboxylic acid (131 mg, 0.54 mmol) and triethylamine (109 mg, 1.1 mmol) were added, DEPC (88 mg, 0.54 mmol) was added at 0° C., and the mixture was stirred overnight at room temperature. Water was added to the reaction mixture and the mixture was extracted with ethyl acetate. The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The residue was subjected to column chromatography using silica gel (30 g), and eluted with hexane-ethyl acetate (9:1-4:1, v/v) to give the title compound (69 mg, 26%) as a colorless amorphous form. the mixture was extracted with ethyl acetate The extract was washed with saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure The residue was dissolved in tetrahydrofuran (3 ml) the mixture was stirred overnight at room temperature the mixture was extracted with ethyl acetate The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure eluted with hexane-ethyl acetate (9:1-4:1

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: TFA (1 ml) was added to tert-butyl (4aR*,5R*,10bR*)-5-phenyl-3,4,4a,5,6,10b-hexahydrobenzo[h]-1,6-naphthyridine-1(2H)-carboxylate (195 mg, 0.54 mmol), and the mixture was stirred at room temperature for 3 min. Ice water was added to the reaction mixture, basified with 8N aqueous sodium hydroxide solution, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The residue was dissolved in tetrahydrofuran (3 ml), (1S,2R)-2-[(tert-butoxycarbonyl)amino]cyclohexanecarboxylic acid (131 mg, 0.54 mmol) and triethylamine (109 mg, 1.1 mmol) were added, DEPC (88 mg, 0.54 mmol) was added at 0° C., and the mixture was stirred overnight at room temperature. Water was added to the reaction mixture and the mixture was extracted with ethyl acetate. The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The residue was subjected to column chromatography using silica gel (30 g), and eluted with hexane-ethyl acetate (9:1-4:1, v/v) to give the title compound (69 mg, 26%) as a colorless amorphous form. the mixture was extracted with ethyl acetate The extract was washed with saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure The residue was dissolved in tetrahydrofuran (3 ml) the mixture was stirred overnight at room temperature the mixture was extracted with ethyl acetate The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure eluted with hexane-ethyl acetate (9:1-4:1

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of the compound (13 g, 40.2 mmol) synthesized in Reference Example 8 and (1S,2R)-2-[(tert-butoxycarbonyl)amino]cyclohexanecarboxylic acid (11.7 g, 48.2 mmol) in DMF (200 ml) were added dropwise triethylamine (16.9 ml, 121 mmol) at 0° C. and subsequently a solution of DEPC (6.74 ml, 40.2 mmol) in DMF (40 ml). The mixture was stirred at the same temperature for 30 min., saturated aqueous sodium hydrogen carbonate solution was added, and the mixture was extracted twice with ethyl acetate. The extract was washed with saturated brine and dried (over anhydrous MgSO4). After concentration under reduced pressure, the obtained residue was subjected to column chromatography using silica gel, and eluted with hexane-ethyl acetate (10:1-1:1, v/v). tert-Butyl (1R,2S)-2-{[(3aR,4R,9bR)-4-phenyl-2,3,3a,4,5,9b-hexahydro-1H-pyrrolo[3,2-c]quinolin-1-yl]carbonyl}cyclohexylcarbamate (9.57 g, 50%) was obtained as a colorless amorphous form from the first object eluted fraction. the mixture was extracted twice with ethyl acetate The extract was washed with saturated brine dried (over anhydrous MgSO4) After concentration under reduced pressure eluted with hexane-ethyl acetate (10:1-1:1

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of the compound (13 g, 40.2 mmol) synthesized in Reference Example 8 and (1S,2R)-2-[(tert-butoxycarbonyl)amino]cyclohexanecarboxylic acid (11.7 g, 48.2 mmol) in DMF (200 ml) were added dropwise triethylamine (16.9 ml, 121 mmol) at 0° C. and subsequently a solution of DEPC (6.74 ml, 40.2 mmol) in DMF (40 ml). The mixture was stirred at the same temperature for 30 min., saturated aqueous sodium hydrogen carbonate solution was added, and the mixture was extracted twice with ethyl acetate. The extract was washed with saturated brine and dried (over anhydrous MgSO4). After concentration under reduced pressure, the obtained residue was subjected to column chromatography using silica gel, and eluted with hexane-ethyl acetate (10:1-1:1, v/v). tert-Butyl (1R,2S)-2-{[(3aR,4R,9bR)-4-phenyl-2,3,3a,4,5,9b-hexahydro-1H-pyrrolo[3,2-c]quinolin-1-yl]carbonyl}cyclohexylcarbamate (9.57 g, 50%) was obtained as a colorless amorphous form from the first object eluted fraction. the mixture was extracted twice with ethyl acetate The extract was washed with saturated brine dried (over anhydrous MgSO4) After concentration under reduced pressure eluted with hexane-ethyl acetate (10:1-1:1

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: TFA (1 ml) was added to tert-butyl (4aR*,5R*,10bR*)-5-phenyl-3,4,4a,5,6,10b-hexahydrobenzo[h]-1,6-naphthyridine-1(2H)-carboxylate (195 mg, 0.54 mmol), and the mixture was stirred at room temperature for 3 min. Ice water was added to the reaction mixture, basified with 8N aqueous sodium hydroxide solution, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The residue was dissolved in tetrahydrofuran (3 ml), (1S,2R)-2-[(tert-butoxycarbonyl)amino]cyclohexanecarboxylic acid (131 mg, 0.54 mmol) and triethylamine (109 mg, 1.1 mmol) were added, DEPC (88 mg, 0.54 mmol) was added at 0° C., and the mixture was stirred overnight at room temperature. Water was added to the reaction mixture and the mixture was extracted with ethyl acetate. The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The residue was subjected to column chromatography using silica gel (30 g), and eluted with hexane-ethyl acetate (9:1-4:1, v/v) to give the title compound (69 mg, 26%) as a colorless amorphous form. the mixture was extracted with ethyl acetate The extract was washed with saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure The residue was dissolved in tetrahydrofuran (3 ml) the mixture was stirred overnight at room temperature the mixture was extracted with ethyl acetate The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure eluted with hexane-ethyl acetate (9:1-4:1

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: TFA (1 ml) was added to tert-butyl (4aR*,5R*,10bR*)-5-phenyl-3,4,4a,5,6,10b-hexahydrobenzo[h]-1,6-naphthyridine-1(2H)-carboxylate (195 mg, 0.54 mmol), and the mixture was stirred at room temperature for 3 min. Ice water was added to the reaction mixture, basified with 8N aqueous sodium hydroxide solution, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The residue was dissolved in tetrahydrofuran (3 ml), (1S,2R)-2-[(tert-butoxycarbonyl)amino]cyclohexanecarboxylic acid (131 mg, 0.54 mmol) and triethylamine (109 mg, 1.1 mmol) were added, DEPC (88 mg, 0.54 mmol) was added at 0° C., and the mixture was stirred overnight at room temperature. Water was added to the reaction mixture and the mixture was extracted with ethyl acetate. The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The residue was subjected to column chromatography using silica gel (30 g), and eluted with hexane-ethyl acetate (9:1-4:1, v/v) to give the title compound (69 mg, 26%) as a colorless amorphous form. the mixture was extracted with ethyl acetate The extract was washed with saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure The residue was dissolved in tetrahydrofuran (3 ml) the mixture was stirred overnight at room temperature the mixture was extracted with ethyl acetate The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure eluted with hexane-ethyl acetate (9:1-4:1

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of the compound (13 g, 40.2 mmol) synthesized in Reference Example 8 and (1S,2R)-2-[(tert-butoxycarbonyl)amino]cyclohexanecarboxylic acid (11.7 g, 48.2 mmol) in DMF (200 ml) were added dropwise triethylamine (16.9 ml, 121 mmol) at 0° C. and subsequently a solution of DEPC (6.74 ml, 40.2 mmol) in DMF (40 ml). The mixture was stirred at the same temperature for 30 min., saturated aqueous sodium hydrogen carbonate solution was added, and the mixture was extracted twice with ethyl acetate. The extract was washed with saturated brine and dried (over anhydrous MgSO4). After concentration under reduced pressure, the obtained residue was subjected to column chromatography using silica gel, and eluted with hexane-ethyl acetate (10:1-1:1, v/v). tert-Butyl (1R,2S)-2-{[(3aR,4R,9bR)-4-phenyl-2,3,3a,4,5,9b-hexahydro-1H-pyrrolo[3,2-c]quinolin-1-yl]carbonyl}cyclohexylcarbamate (9.57 g, 50%) was obtained as a colorless amorphous form from the first object eluted fraction. the mixture was extracted twice with ethyl acetate The extract was washed with saturated brine dried (over anhydrous MgSO4) After concentration under reduced pressure eluted with hexane-ethyl acetate (10:1-1:1

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of the compound (13 g, 40.2 mmol) synthesized in Reference Example 8 and (1S,2R)-2-[(tert-butoxycarbonyl)amino]cyclohexanecarboxylic acid (11.7 g, 48.2 mmol) in DMF (200 ml) were added dropwise triethylamine (16.9 ml, 121 mmol) at 0° C. and subsequently a solution of DEPC (6.74 ml, 40.2 mmol) in DMF (40 ml). The mixture was stirred at the same temperature for 30 min., saturated aqueous sodium hydrogen carbonate solution was added, and the mixture was extracted twice with ethyl acetate. The extract was washed with saturated brine and dried (over anhydrous MgSO4). After concentration under reduced pressure, the obtained residue was subjected to column chromatography using silica gel, and eluted with hexane-ethyl acetate (10:1-1:1, v/v). tert-Butyl (1R,2S)-2-{[(3aR,4R,9bR)-4-phenyl-2,3,3a,4,5,9b-hexahydro-1H-pyrrolo[3,2-c]quinolin-1-yl]carbonyl}cyclohexylcarbamate (9.57 g, 50%) was obtained as a colorless amorphous form from the first object eluted fraction. the mixture was extracted twice with ethyl acetate The extract was washed with saturated brine dried (over anhydrous MgSO4) After concentration under reduced pressure eluted with hexane-ethyl acetate (10:1-1:1

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 2.0 M solution of (trimethylsilyl)diazomethane in diethyl ether (5.0 mL, 10.0 mmol) was added over 10 min to a solution of (1S,2R)-2-tert-butoxycarbonylamino-1-cyclohexanecarboxylic acid (0.994 g, 4.09 mmol; purchased from NeoMPS) in a 1:1 mixture of benzene and methanol (50 mL) at 25° C. The resulting mixture was stirred at 25° C. for 30 min, and then was partitioned between half-saturated sodium bicarbonate solution (150 mL) and ethyl acetate (2×150 mL). The combined organic layers were dried over sodium sulfate, decanted, and were concentrated in vacuo to afford the desired product, (1S,2R)-2-tert-butoxycarbonylamino-1-cyclohexanecarboxylic acid methyl ester (1.00 g, 3.89 mmol, 95%), as a colorless oil. 1H NMR (400 MHz, CDCl3) δ: 1.44 (9H, s), 1.58-1.68 (3H, m), 1.72-1.81 (2H, m), 1.98-2.05 (2H, m), 2.77-2.80 (1H, m), 3.69 (3H, s), 3.82-3.90 (1H, m), 5.29-5.31 (1H, m). LC-MS (ESI) calcd for C13H23NO4 257.16, found 258.2 [M+H+]. was partitioned between half-saturated sodium bicarbonate solution (150 mL) and ethyl acetate (2×150 mL) The combined organic layers were dried over sodium sulfate decanted were concentrated in vacuo

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 2.0 M solution of (trimethylsilyl)diazomethane in diethyl ether (5.0 mL, 10.0 mmol) was added over 10 min to a solution of (1S,2R)-2-tert-butoxycarbonylamino-1-cyclohexanecarboxylic acid (0.994 g, 4.09 mmol; purchased from NeoMPS) in a 1:1 mixture of benzene and methanol (50 mL) at 25° C. The resulting mixture was stirred at 25° C. for 30 min, and then was partitioned between half-saturated sodium bicarbonate solution (150 mL) and ethyl acetate (2×150 mL). The combined organic layers were dried over sodium sulfate, decanted, and were concentrated in vacuo to afford the desired product, (1S,2R)-2-tert-butoxycarbonylamino-1-cyclohexanecarboxylic acid methyl ester (1.00 g, 3.89 mmol, 95%), as a colorless oil. 1H NMR (400 MHz, CDCl3) δ: 1.44 (9H, s), 1.58-1.68 (3H, m), 1.72-1.81 (2H, m), 1.98-2.05 (2H, m), 2.77-2.80 (1H, m), 3.69 (3H, s), 3.82-3.90 (1H, m), 5.29-5.31 (1H, m). LC-MS (ESI) calcd for C13H23NO4 257.16, found 258.2 [M+H+]. was partitioned between half-saturated sodium bicarbonate solution (150 mL) and ethyl acetate (2×150 mL) The combined organic layers were dried over sodium sulfate decanted were concentrated in vacuo

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: TFA (1 ml) was added to tert-butyl (4aR*,5R*,10bR*)-5-phenyl-3,4,4a,5,6,10b-hexahydrobenzo[h]-1,6-naphthyridine-1(2H)-carboxylate (195 mg, 0.54 mmol), and the mixture was stirred at room temperature for 3 min. Ice water was added to the reaction mixture, basified with 8N aqueous sodium hydroxide solution, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The residue was dissolved in tetrahydrofuran (3 ml), (1S,2R)-2-[(tert-butoxycarbonyl)amino]cyclohexanecarboxylic acid (131 mg, 0.54 mmol) and triethylamine (109 mg, 1.1 mmol) were added, DEPC (88 mg, 0.54 mmol) was added at 0° C., and the mixture was stirred overnight at room temperature. Water was added to the reaction mixture and the mixture was extracted with ethyl acetate. The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The residue was subjected to column chromatography using silica gel (30 g), and eluted with hexane-ethyl acetate (9:1-4:1, v/v) to give the title compound (69 mg, 26%) as a colorless amorphous form. the mixture was extracted with ethyl acetate The extract was washed with saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure The residue was dissolved in tetrahydrofuran (3 ml) the mixture was stirred overnight at room temperature the mixture was extracted with ethyl acetate The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure eluted with hexane-ethyl acetate (9:1-4:1

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: TFA (1 ml) was added to tert-butyl (4aR*,5R*,10bR*)-5-phenyl-3,4,4a,5,6,10b-hexahydrobenzo[h]-1,6-naphthyridine-1(2H)-carboxylate (195 mg, 0.54 mmol), and the mixture was stirred at room temperature for 3 min. Ice water was added to the reaction mixture, basified with 8N aqueous sodium hydroxide solution, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The residue was dissolved in tetrahydrofuran (3 ml), (1S,2R)-2-[(tert-butoxycarbonyl)amino]cyclohexanecarboxylic acid (131 mg, 0.54 mmol) and triethylamine (109 mg, 1.1 mmol) were added, DEPC (88 mg, 0.54 mmol) was added at 0° C., and the mixture was stirred overnight at room temperature. Water was added to the reaction mixture and the mixture was extracted with ethyl acetate. The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine, dried (over anhydrous MgSO4), and the solvent was evaporated under reduced pressure. The residue was subjected to column chromatography using silica gel (30 g), and eluted with hexane-ethyl acetate (9:1-4:1, v/v) to give the title compound (69 mg, 26%) as a colorless amorphous form. the mixture was extracted with ethyl acetate The extract was washed with saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure The residue was dissolved in tetrahydrofuran (3 ml) the mixture was stirred overnight at room temperature the mixture was extracted with ethyl acetate The extract was washed with 6% aqueous sodium hydrogen carbonate solution and saturated brine dried (over anhydrous MgSO4) the solvent was evaporated under reduced pressure eluted with hexane-ethyl acetate (9:1-4:1